Boiler-cleaning device.



' vL. SMITH & G. D. MULLIHAN.

BOILER CLEANING DEVICE. APPLICATION FILED APR; 25, 190?.

ooooacoo V anooo0-00 nook Patented M1117; 1911.

UNITED STATES PATENT OFFICE.

LAURENCE SMITH AND GEORGE D. MULLII-IAN, OF WEBB CITY, MISSOURI.

BOILER-CLEANING DEVICE.

To all whom it may concern:

Be it known that we, LAURENCE SMITH and GEORGE D. MULLIHAN, of lVebbCity, in the county of Jasper and State of Missouri, have inventedcertain new and useful Improvements in Cleaners for Steam-Boilers; andwe do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had tothe accompanyingdrawings, forming a part of this specification.

Our invention relates to boiler cleaning devices, and consists of spiralblades, or the like, attached to a shaft and adapted to be placed in aboiler, as shown, in conjunction with a propeller screw on a shaft inthe blow-off pipe between its valve and the boiler.

The object thereof is to so construct the same that it willautomatically clean boilers when they are in operation; and willeffectively remove all scale, mud, sediment, and the like from therecepacle in which it is placed.

In the drawings forming a part of this specification, and in which likesymbols of reference represent corresponding parts in the several views:-Figure 1 is an elevation showing our rotary boiler cleaner in'operative position; Fig. 2 is an enlarged view of the blow-off pipe,with propeller therein, said parts being partly in section; Fig. 3 is atransverse section of the propeller, on the line 3-3, of Fig. 1; and,Fig. 4 is a sectional view of shaft and shaft supports, with cleaningblades thereon.

As shown in Fig. 1, our cleaner is supported in the bottom of the boilerand extends the whole length of the same. The blades m preferably have apitch equal to one-and-one-half times around the length of shaft 71, andare fastened to shaft h by arms a. Shaft 72. is located on stands 8 andsecured thereon by caps 0. Stands 8 are secured in place between thetubes and the Specification of Letters Patent.

Application filed April 25, 1908.

Patented Jan. 17, 1911.

Serial No. 429,290.

1 bottom of the boiler preferably by turnbuckles j and cross-pieces 7c.Shaft h is fastened to propeller screw shaft 2' by coupling e.

The propeller which operates in the blowoff pipe is composed of bladescl secured to shaft 2' by lugs 0, inclosed in an enlarged portion orcasing of blow-off pipe B, formed by collars a connected by pipe orsleeve f The casing proper, B, is connected to boiler and gate valve bysleeves b- 6.

hen our cleaner is installed, and it is desired to clean the boiler, theoperator turns valve 9 in blow-off pipe 6, allowing the passage of steamand water from inside of boiler to bear against and revolve thepropeller screw, in its passage to the atmosphere, and the propellerrevolves shaft h, while the blades attached to the shaft, in itsrevolution agitate the water, thus, stirring the sediment and moving itto the blow-off pipe.

Having now fully described our invention, what we claim as new anddesire to secure by Letters-Patent, is

1. The combination with a boiler having a blow-off pipe and a valvetherein, a shaft in said boiler, spiral cleaner blades secured by armsto said shaft, and a propeller wheel on said shaft within said blow-offpipe between said valve and said boiler.

2. A boiler cleaner, consisting of a main shaft carrying blades adaptedfor operation in a boiler, means for supporting and securing the shaftin a boiler, a blow-off pipe, a blow-off on said pipe, an enlargedcasing on the blow-off pipe, and a propeller connected to the main shaftand within said casing.

LAURENCE SMITH.- [Ls] GEORGE D. MULLIHAN. [Ls] WVitnesses:

IRA T. HARRIS, L. M. HARRIS.

